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arxiv: 2606.04902 · v1 · pith:5MLNTJNWnew · submitted 2026-06-03 · 💻 cs.ET

ThermoPix: A High-Spatial-Resolution ElectronicPhotonic Temperature Sensor Array With Microsecond Row Readout

Md Rahatul Islam Udoy , Dharanidhar Dang , Wantong Li , Sumeet Kumar Gupta , Suman Datta , Ahmedullah Aziz This is my paper

Pith reviewed 2026-06-28 02:47 UTC · model grok-4.3

classification 💻 cs.ET
keywords temperature sensor arrayelectronic-photonic integrationMach-Zehnder interferometertiming-based readoutCMOS compatiblephotonic sensorsensor arrayphase transition material
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The pith

ThermoPix converts temperature-induced wavelength shifts in a photonic interferometer into timing signals for CMOS readout.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper presents ThermoPix, a CMOS-compatible electronic-photonic architecture for high-spatial-resolution temperature sensing. It converts temperature-induced wavelength shifts in a photonic interferometric sensor into timing information that can be processed by CMOS circuitry using a valley photonic crystal Mach-Zehnder interferometer detected by a waveguide photodetector and a phase-transition-material CMOS circuit. Circuit-level simulations show a temperature sensitivity of 3.15 ns/K, a row readout time of 2 us, and a sensing power-delay product of 0.152 fJ with 150 nW optical power per cell. Alternative power distribution methods allow average cell pitches of 23.26 um or 38.52 um, providing a scalable platform for integrated temperature sensing arrays.

Core claim

The central claim is that the VPCMZI's temperature-dependent spectral response, when detected by the integrated waveguide photodetector and translated into a time-varying photocurrent, can be used by a phase-transition-material device in CMOS to perform threshold detection and generate a timing signal corresponding to the temperature, achieving the reported performance metrics in simulations.

What carries the argument

The valley photonic crystal Mach-Zehnder interferometer (VPCMZI) that converts temperature to spectral shift, combined with photodetector and phase-transition-material CMOS threshold detector to produce timing output.

If this is right

  • Temperature sensitivity reaches 3.15 ns/K.
  • Row readout completes in 2 microseconds.
  • Power-delay product is 0.152 fJ per sensing event.
  • Cell pitches can be 23.26 micrometers with varying tap ratios or 38.52 micrometers with bidirectional excitation.
  • Optical power requirement is 150 nW per photonic cell.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • This timing-based approach could reduce the need for complex analog circuitry in sensor arrays.
  • The design may enable integration of temperature sensing directly into photonic-electronic chips for real-time thermal management.
  • Power distribution schemes provide options for optimizing array density versus power uniformity.
  • The method might extend to other parameters sensed via wavelength shifts in similar photonic structures.

Load-bearing premise

The temperature-dependent spectral response of the VPCMZI produces a clean time-varying photocurrent whose threshold crossing can be reliably detected by the phase-transition-material CMOS circuit without significant impact from noise or fabrication variation.

What would settle it

Fabrication and testing of a prototype array cell to measure the actual timing shift per Kelvin and observe if noise or variations cause unreliable threshold detections.

Figures

Figures reproduced from arXiv: 2606.04902 by Ahmedullah Aziz, Dharanidhar Dang, Md Rahatul Islam Udoy, Suman Datta, Sumeet Kumar Gupta, Wantong Li.

Figure 1
Figure 1. Figure 1: (a) Simplified overview of the thermal sensor system. A wavelength-swept laser source provides input light whose wavelength is linearly swept in time and injected into the valley photonic crystal Mach-Zehnder interferometer (VPC-MZI) temperature sensor. Temperature variations cause a shift in the interference condition of the Mach-Zehnder interferometer, resulting in a change in the detected optical power.… view at source ↗
Figure 2
Figure 2. Figure 2: (a) VPC-MZI compact modeling methodology showing the proposed modeling flow used to estimate the output light power of the VPC￾MZI. The wavelength-swept input light and local temperature are used to obtain the refractive index from a lookup table, which is then used to calculate the phase difference and evaluate the resulting output optical power. (b) Refractive index data as a function of wavelength and t… view at source ↗
Figure 3
Figure 3. Figure 3: (a) Photonic circuit layer consisting of an m × n array of photonic cells connected through a series of tap couplers. A wavelength-swept laser source feeds the circuit through an input coupler and a 1 × m tree switch. The tree switch routes the full optical power from the laser to one row at a time, similar to a rolling-shutter operation. The tap ratios are chosen so that each photonic cell receives approx… view at source ↗
Figure 4
Figure 4. Figure 4: (a) Photonic layer transient operation. A wavelength-swept laser performs a linear sweep in time and drives the VPC-MZI sensor. This transient sweep converts the temperature-dependent spectral shift of the VPC-MZI into a time-domain signal. The proposed compact model of the VPC-MZI enables HSPICE-compatible circuit simulation. The optical signal is detected by a WG photodetector and the resulting electrica… view at source ↗
Figure 5
Figure 5. Figure 5: (a)-(l) Simulated waveforms of the ThermoPix circuit shown in [PITH_FULL_IMAGE:figures/full_fig_p009_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: (a) Photonic circuit layer architecture using identical tap ratios for all tap couplers. A wavelength-swept laser source feeds the circuit through a 50-50 splitter. The optical power propagates in both left and right directions along the waveguides. Bidirectional propagation enables a design where identical tap couplers can be used throughout the array. Each photonic cell receives light from two tap couple… view at source ↗
read the original abstract

This paper presents ThermoPix, a CMOS-compatible electronic-photonic architecture for high-spatial-resolution temperature sensing. The proposed system converts temperature-induced wavelength shifts in a photonic interferometric sensor into timing information that can be processed by CMOS circuitry. We use a valley photonic crystal Mach-Zehnder interferometer (VPCMZI) as the sensing element, whose temperature-dependent spectral response is detected using an integrated waveguide photodetector and translated into a time-varying photocurrent. A CMOS readout circuit employing a phase-transition-material device performs threshold detection and generates a timing signal corresponding to the temperature-dependent crossing event. Circuit-level simulations demonstrate a temperature sensitivity of 3.15 ns/K, a row readout time of 2 us, and a sensing power-delay product (PDP) of 0.152 fJ. The required optical power per photonic cell is 150 nW, enabling energy-efficient array operation without requiring cooling or special environmental arrangements. We also present alternative photonic layer architectures for optical power distribution across the array. In one approach, we use different tap ratios along the row, while the other uses identical tap ratios with bidirectional excitation. The resulting average photonic cell pitches are 23.26 um and 38.52 um, respectively. The proposed ThermoPix architecture therefore provides a scalable platform for integrated temperature sensing arrays that combine photonic sensing elements with CMOS-compatible timing-based readout.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 0 minor

Summary. The paper presents ThermoPix, a CMOS-compatible electronic-photonic architecture for high-spatial-resolution temperature sensing using a valley photonic crystal Mach-Zehnder interferometer (VPCMZI) whose temperature-dependent spectral response is detected by an integrated waveguide photodetector and converted to a timing signal via a phase-transition-material (PTM) CMOS readout circuit. Circuit-level simulations are reported to achieve 3.15 ns/K temperature sensitivity, 2 μs row readout time, 0.152 fJ sensing power-delay product (PDP), and 150 nW optical power per cell, along with two alternative photonic power-distribution schemes yielding average cell pitches of 23.26 μm and 38.52 μm.

Significance. If the simulation results hold under realistic conditions, the work could demonstrate a scalable, energy-efficient approach to integrating photonic temperature sensors with CMOS timing readout, enabling dense arrays without cooling or special environments and addressing needs for high-resolution thermal sensing in emerging-technology applications.

major comments (1)
  1. [Abstract and readout circuit paragraph] Abstract and readout-circuit paragraph: the reported metrics (3.15 ns/K sensitivity, 2 μs row readout, 0.152 fJ PDP) rest on circuit-level simulations of the VPCMZI spectral shift → waveguide-PD photocurrent → PTM threshold-crossing chain. No indication is given that these simulations include shot/thermal noise at the stated 150 nW optical power, fabrication-induced resonance variation, or PTM hysteresis/finite switching time; any of these could shift the effective crossing time by more than a few ns and render the sensitivity and PDP claims unreliable for array-scale operation.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the careful review and for highlighting the assumptions underlying our circuit-level simulations. We address the major comment below and will revise the manuscript accordingly.

read point-by-point responses

  1. Referee: [Abstract and readout circuit paragraph] Abstract and readout-circuit paragraph: the reported metrics (3.15 ns/K sensitivity, 2 μs row readout, 0.152 fJ PDP) rest on circuit-level simulations of the VPCMZI spectral shift → waveguide-PD photocurrent → PTM threshold-crossing chain. No indication is given that these simulations include shot/thermal noise at the stated 150 nW optical power, fabrication-induced resonance variation, or PTM hysteresis/finite switching time; any of these could shift the effective crossing time by more than a few ns and render the sensitivity and PDP claims unreliable for array-scale operation.

    Authors: We agree that the reported metrics derive from ideal circuit-level simulations that do not incorporate shot/thermal noise at 150 nW, fabrication-induced resonance shifts, or PTM hysteresis and finite switching dynamics. These non-idealities are not modeled in the presented results, and their inclusion could indeed alter the effective timing precision. In the revised manuscript we will (1) explicitly state in the abstract and simulation sections that the metrics assume ideal conditions, (2) add a new subsection quantifying the expected impact of each effect using published device parameters, and (3) note that full noise-inclusive verification remains future work. This will clarify the scope of the claims without overstating the current simulation fidelity. revision: yes

Circularity Check

0 steps flagged

No circularity; simulation outputs are independent of fitted inputs

full rationale

The paper reports its headline metrics (3.15 ns/K sensitivity, 2 µs row readout, 0.152 fJ PDP) explicitly as outputs of circuit-level simulations of the VPCMZI spectral shift, waveguide PD photocurrent, and PTM threshold crossing. No equations, derivations, or parameter fits are shown that would make these quantities equivalent to their own inputs by construction. No self-citations, ansatzes smuggled via prior work, or uniqueness theorems are invoked to justify the architecture. The derivation chain is therefore self-contained against external simulation benchmarks rather than tautological.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central performance claims rest on standard compact models for photonic devices and CMOS transistors plus the unverified assumption that the phase-transition-material device produces ideal threshold detection. No free parameters are explicitly fitted in the abstract, but the reported sensitivity and PDP implicitly depend on chosen device dimensions and material parameters not disclosed.

axioms (1)
  • domain assumption Standard temperature-dependent refractive index shift in silicon photonic waveguides and ideal threshold behavior of phase-transition-material devices hold without significant process variation.
    Invoked when translating spectral response to timing signal in the readout circuit description.

pith-pipeline@v0.9.1-grok · 5801 in / 1326 out tokens · 42379 ms · 2026-06-28T02:47:17.004078+00:00 · methodology

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